Road Built 7,000 Years Ago Found at The Bottom of The Mediterranean Sea

Archaeologists have unearthed the remnants of a 7,000-year-old road hidden beneath layers of sea mud off the southern Croatian coast.

Made at the sunken Neolithic site of Soline, this exciting find may once have linked the ancient Hvar culture settlement to the now isolated island of Korčula.
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At around 4 meters (13 feet) wide, the thoroughfare was constructed of carefully stacked stone slabs. Today it's covered in a thick layer of mud, as you might expect for an underwater structure.

https://www.sciencealert.com/road-built-7000-years-ago-found-at-the-bottom-of-the-mediterranean-sea

Stacked stone sounds more like a causeway built because rising water was cutting off some of the settlements.